关键词: 黄土高原, 果园生草, 土壤物理性质, 白三叶, 黑麦草

Abstract: The plots were layout in planting herbage areas and till areas of different herbage in non-irrigated apple orchard from the Weibei Loess Plateau, soil samples from different soil layers within 60 cm in every plot were collected. By analyzing soil samples, effects of different herbage on soil physical properties of the apple orchard were studied. The results showed that soil bulk density was reduced, soil porosity was increased and the content of water-stable aggregates was increased after different herbage was planted. The changes in soil physical properties with growing different herbage in non-irrigated apple orchard were mainly in 40 cm soil layer. The change feature of soil physical properties was different in various growing herbage land. With growing herbage years, soil physical properties of growing herbage land were improved better. Soil water content and soil water-holding capacity were enhanced greatly. Consequently, growing herbage in orchard in long term can improve the soil properties of orchard lastly, white clover was better than perennial ryegrass in improving soil physical properties.

Key words: Loess Plateau, growing herbage in orchard, soil physical properties, white clover, perennial ryegrass